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In particular, for longer driving wavelengths and quantum dots smaller than 3\u00a0nm, HHG was strongly suppressed; however, there is no computational model capable of describing the strong-field response of such systems. In this work, we introduce a computationally efficient three-dimensional real-space tight-binding model specifically designed for the simulation of HHG in confined systems. The model parameters are meticulously derived from density functional theory calculations for the semiconductor bulk, followed by a process of Wannierization. Our findings demonstrate that the proposed model accurately captures the observed dependency of the HHG yield on the quantum dot size. In addition, we simulate the HHG yield for elliptically polarized pulses for different QD-sizes and driving wavelengths up to 5\u00a0\u03bcm. The proposed model fills the theoretical void in simulating HHG within medium-sized nanostructures, which cannot be described by methods applied for periodic solids, or small molecules or atoms.<\/jats:p>","DOI":"10.1063\/5.0314362","type":"journal-article","created":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T11:41:54Z","timestamp":1772624514000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Modeling high-order harmonic generation in quantum dots using a real-space tight-binding approach"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8171-7895","authenticated-orcid":false,"given":"Martin","family":"Th\u00fcmmler","sequence":"first","affiliation":[{"name":"Institute of Physical Chemistry, Friedrich Schiller University 1 , Jena,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9296-9350","authenticated-orcid":false,"given":"Alexander","family":"Croy","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry, Friedrich Schiller University 1 , Jena,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3980-9224","authenticated-orcid":false,"given":"Ulf","family":"Peschel","sequence":"additional","affiliation":[{"name":"Institute of Condensed Matter Theory and Optics, Friedrich Schiller University 2 , Jena,","place":["Germany"]},{"name":"Abbe School of Photonics, Friedrich Schiller University 3 , Jena,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1747-5809","authenticated-orcid":false,"given":"Stefanie","family":"Gr\u00e4fe","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry, Friedrich Schiller University 1 , Jena,","place":["Germany"]},{"name":"Abbe School of Photonics, Friedrich Schiller University 3 , Jena,","place":["Germany"]},{"name":"Fraunhofer Institute for Applied Optics and Precision Engineering 4 , Jena,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,3,4]]},"reference":[{"key":"2026030406414542400_c1","doi-asserted-by":"publisher","first-page":"L31","DOI":"10.1088\/0953-4075\/21\/3\/001","article-title":"Multiple-harmonic conversion of 1064\u00a0nm radiation in rare gases","volume":"21","year":"1988","journal-title":"J.\u00a0Phys. 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